Canon Patent Application: Yet another super-telephoto patent

I've actually skipped a few super telephoto patent applications just because they were starting to get tiresome and repetitive.  This one seems to be quite detailed and goes into the lens body engineering as well as the optical design.

So I thought it was kind of neat unlike most that we've run across lately.

This actual patent deals mostly with the case and handling thermal expansion under high temperatures.

[0001] The present disclosure relates to a lens holding mechanism of a lens apparatus and an image pickup apparatus including the lens apparatus. 

[0002] Lens apparatuses including an interchangeable lens used in a digital still camera are used under various environments. For example, in a case in which the lens apparatus is used in a high-temperature environment, temperatures of the lenses included in the lens apparatus may increase, and the optical characteristics of the lenses may be changed. 

FOCAL LENGTH 392.56
F-number 2.90
HALF FIELD ANGLE 3.15
IMAGE HEIGHT 21.64
TOTAL LENS LENGTH 371.98 
BF 61.34

FOCAL LENGTH 488.82
F-number 4.10
HALF FIELD ANGLE 2.53
IMAGE HEIGHT 21.64
TOTAL LENS LENGTH 411.90 
BF 71.62 

FOCAL LENGTH 778.70
F-number 5.83
HALF FIELD ANGLE 1.59
IMAGE HEIGHT 21.64
TOTAL LENS LENGTH 486.03 
BF 71.54

US Patent Application 20190129135

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